Doubled Quantum Spin Hall Effect with High-Spin Chern Number in $\alpha$-Antimonene and $\alpha$-Bismuthene

Abstract

The discovery of quantum spin Hall effect has ignited the field of topological physics with vast variety of exotic properties. Here, we present the emergence of doubled quantum spin Hall effect in two dimensions characterized with a high spin Chern number of ${\mathcal{C}}_S=2$ and two pairs of helical edge states. Although is overlooked and invisible in topological quantum chemistry and symmetry indicator theory, the already experimentally synthesized $\alpha$-antimonene and $\alpha$-bismuthene are revealed as realistic material candidates of predicted topological states with band inversions emerging at generic $k$-points, rather than the high-symmetry momenta. Remarkably, the nontrivial energy gap can be as large as 464 meV for $\alpha$-bismuthene, indicating the high possibility of room-temperature observation of the doubled quantum spin Hall effect. Moreover, a four-band effective model is constructed to demonstrate further the feasibility of attaining this type of nontrivial topology. Our results not only uncover a novel topological character of antimony and bismuth, but will also facilitate the experimental characterization of the previously overlooked hidden topology.

arXiv comment4 figures

References in corpus (57)

• The electronic properties of graphene
• Topological Insulators
• Topological insulators and superconductors
• Quantum Spin Hall Effect in Graphene
• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• Discovery of a Three-dimensional Topological Dirac Semimetal, Na3Bi
• Topological Crystalline Insulators
• Dirac semimetal and topological phase transitions in A3Bi (A=Na, K, Rb)
• Higher-Order Topological Insulators
• Topological quantum chemistry
• Colloquium: Topological Band Theory
• Theoretical Discovery/Prediction: Weyl Semimetal states in the TaAs material (TaAs, NbAs, NbP, TaP) class
• Topological Crystalline Insulators in the SnTe Material Class
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Intrinsic magnetic topological insulators in van der Waals layered MnBi${}_2$Te${}_4$-family materials
• Bismuthene on a SiC Substrate: A Candidate for a New High-Temperature Quantum Spin Hall Paradigm
• First Principles Calculation of Anomalous Hall Conductivity in Ferromagnetic bcc Fe
• Topological axion states in magnetic insulator MnBi${}_2$Te${}_4$ with the quantized magnetoelectric effect
• Dirac Line Nodes in Inversion Symmetric Crystals
• Topological Nodal Line Semimetal and Dirac Semimetal State in Antiperovskite Cu${}_3$PdN
• Symmetry-based Indicators of Band Topology in the 230 Space Groups
• The space group classification of topological band insulators
• Topological classification of crystalline insulators through band structure combinatorics
• Inversion Symmetric Topological Insulators
• Hourglass Fermions
• Fragile Topology and Wannier Obstructions
• Well-localized edge states in two-dimensional topological insulators: ultrathin Bi films
• Spin-filtered Edge States with an Electrically Tunable Gap in a Two-Dimensional Topological Crystalline Insulator
• Stable nontrivial Z2 topology in ultrathin Bi (111) films: a first-principles study
• Quantitative mappings between symmetry and topology in solids
• Time-reversal-symmetry-broken quantum spin Hall effect
• Quantized Response and Topology of Insulators with Inversion Symmetry
• Structure and Topology of Band Structures in the 1651 Magnetic Space Groups
• Epitaxial growth of large-gap quantum spin Hall insulator on semiconductor surface
• Direct Evidence for the Dirac-Cone Topological Surface States in Ternary Chalcogenide TlBiSe2
• Single-Dirac-Cone topological surface states in TlBiSe2 class of Topological Insulators
• Quantum Anomalous Hall Effect with Higher Plateaus
• Large-Gap Quantum Spin Hall Insulator in single layer bismuth monobromide Bi${}_4$Br${}_4$
• Opportunities in topological insulator devices
• Boundary-obstructed topological phases
• A Novel Quasi-One-Dimensional Topological Insulator in Bismuth Iodide $\beta$-Bi${}_4$I${}_4$
• First Principles Calculations for Topological Quantum Materials
• $\mbox{Bi}_{1}\mbox{Te}_{1}$: a dual topological insulator
• Topological Phase Transition without Gap Closing
• Functionalized Bismuth Films: Giant Gap Quantum Spin Hall and Valley-Polarized Quantum Anomalous Hall States
• MagneticTB: A package for tight-binding model of magnetic and non-magnetic materials
• Topological Materials Discovery By Large-order symmetry indicators
• Strain induced topological phase transitions in monolayer honeycomb structures of group-V binary compounds
• Measurement of spin Chern numbers in quantum simulated topological insulators
• Surface states on a topologically non-trivial semimetal: The case of Sb(110)
• High-throughput screening for Weyl Semimetals with S${}_4$ Symmetry
• Topological band structure transitions in honeycomb antimonene as function of buckling
• Topological obstructed atomic limit by annihilating Dirac fermions

Cited by in corpus (8)

• Spin-Resolved Topology and Partial Axion Angles in Three-Dimensional Insulators
• Photo-induced electronic and spin topological phase transitions in monolayer bismuth
• Orbital doublet driven even-spin Chern insulators
• High-throughput calculations of spin Hall conductivity in non-magnetic 2D materials
• Dual topological insulator with mirror symmetry protected helical edge states
• Mastering the growth of antimonene on Bi2Se3: strategies and insights
• Spin Weyl Topological Insulators
• Quantum geometric bounds in spinful systems with trivial band topology